Answer:
28 metres
Explanation:
when the bag is about to hit the ground
potential energy = kinetic energy
[tex]mgh = \frac{1}{2}mv^{2}[/tex]
where m = mass
g = acceleration due to gravity
v = speed
when you simplify the above equation and make v subject of the formular we have
[tex]v=\sqrt{2gh}[/tex]
where g = 9.8m/s
h = 40
[tex]v=\sqrt{2\times 9.8\times 40}=28m[/tex]
